Tension device.



G. RYDEN.

TENSION DEVICE.

APPLIOATION FILED MAR. 25, 1912.

Patented Dec; 31, 1912.

2 SHEETB-SHBET 1.

UNITE STATES PATENT OFFICE.

CLAES RYDEN, 0F PROVIDENCE, RHODE ISLAND, ASSIGNOR TO UNIVERSAL WINDING COMPANY, OF PORTLAND, MAINE, A CORPORATION OF MAINE.

TENSION DEVICE.

Specification of Letters Patent.

Patented Dec. 31, 1912.

To all whom it may concern:

Be it known that I, CLAES RYDEN, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Tension Devices, of which the following is a specification.

My invention relates to tension-devices and consists of an improved means for applying. tension to yarn, thread or twine deliver-ing from cops, bobbins or other supply packages.

The object of my improvement is to provide a device which will restrain the yarn from flying out or ballooning as it unwinds from the bobbin or other supply, thereby giving greater uniformity of tension and preventing kinking or snarling of the yarn.

The invention is fully described in the following specification, illustrated by the accompanying drawings, in wh1ch:--

Figure 1 is a view showing a usual form of bobbin having my new device applied thereto; Fig. 2, a view of a part of the device shown in detail; Fig. 3, a view showing a modification in the form of the invention, and illustratin a different method of draw in the yarn o from the bobbin.

y new device is particularly adapted for use with cops or bobbins which are wound with superimposed conical layers progressing along the central tube or holder to form a cylindrical, body portion terminating in a tapered delivery end 'or nose from which the yarn unwinds.

In Fig. 1 I have illustrated a bobbin B of this form adapted for use particularly with knitting machines, or for any other purpose where it is required to deliver yarn in the various processes of manufacture. The bobbin is usually wound on a holder or support 6 which is generally formed with a tapering base 6 and a tubular barrel or shank 12 extending therefrom. In deliver" ing the yarn from the bobbin the latter is preferably set upon a base-plate or standard S, which has attached thereto an upright arm .9, bent at s to extend over the center of the bobbin, and supporting an eye or guide 9 through which the yarn 3 draws.

My newtension-device in its preferred embodiment consists essentially of a .nushroom-shaped cap C having a plug 0 adapted to fit the bore in the end of the holder 6 and provided with an upwardly-extending projection or stud 0' on which a ring D is loosely mounted. The head of the cap C is preferably a little lar er in diameter than the barrel 6 of the boibin-holder b, and is formed with its lower edge slightly rounded oil and curving into the full convex surface on top. The upwardly-extending projection 0' is also rounded or semi-spherical on top so that all the parts present smooth surfaces to the yarn which draws across them.

The ring D is preferably cylindrical in cross-section and is of sufficient diameter to adapt it to fit over the projection or stud c with a slight clearance between the two. Normall the rin D rests on the main portion or cad of tie cap C and the yarn is drawn up through the rin as illustrated in Fig. 1. The device may e threaded by removing the ring D from the cap and leading the yarn through it, after which the ring is replaced on .the stud 0', but to provide for greater convenience in threading, I prefer to construct the ring D with a slit or openin d through which the yarn can be inserted into the ring without the necessity of leading its end through. Referring to Fig. 2, the slit (Z is cut through'the ring on an angle, instead of radially, so as to prevent the yarn from drawing out through the slit as it slides around the ring as hereinafter more fully explained.

The operation of the device above described is as follows: The cap C is placed on top of the bobbin and the yarn 3 led up under and through the rin D as shown in Fig. 1. From the ring D tie yarn leads up through the guide g, and thence to the ma chine in which it is to be used. As the am is taken up by the machine it unwinds mm the bobbin and draws up over the rounded face of the cap C and between the ring D and the projection c. The resistance to the unwinding of the yarn at the bobbin causes it to travel around the cap and this sets up a slight friction which is augmented by the action of the ring D. That is to say, the ring D holds the yarn against the stud c and in this way a light, delicate tension is applied. The amount of tension can be varied as required by using heavier or llghter rings. Referring again to Fig. 2,

the arrow :12 indicates the direction of travel of the yarn around the ring D, and it will be noted that owing to the angular arrangement of the slit d there will be no possibility of the yarn pulling out through the slit. Furthermore, the yarn will not meet with any obstruction from the slit (1 in its passage around the ring D, as it will slide off of the sharp point d of the slit onto the smooth edge 0?.

Fig. 3 shows a modification of the invention and illustrates another method of drawing off the yarn from the bobbim In some cases it is desirable to lead the yarn off from the base of the bobbin and this is accomplished by arranging the device in the following manner: The cap C is constructed with an axial opening 0 extending down through the plug 0, and at the top of the oapthe opening has a flaring mouth adapted to receive a ball E. With this ar rangement the ,yarn 3/ is Led up over the curved face of the cap C and down through the opening 0 The base or standard S on i which the bobbin B sets has a vertical tube or upright 8 and the yarn leads down through this and draws out through an opening s in one of the legs 8 of the stand-' ard. It will be understood that the standard for the bobbin here shown and y described forms no part of the present invention and any other suitable arrangement might be used for leadin the yarn out through the base of the bo bin. After the yarn has been threaded through the cap C, as described, the ball E is placed in the opening 0 to impinge on the yarn and press it against the cap. As the yarn unwinds from the bobbin it circles around the edge of the cap and this sets up a friction which is augmented by the weight of the ball E. In this way tension is applied to the yarn to control its delivery in practically the same manner as that previously described in connection with the operation of the ring Don the cap 0, the arrangement of the parts being merely inverted.

It Will beobserved that with my new device the tension is applied to the yarn directly at the top of the bobbin so that the length of yarn extending from the bob-.

bin to the machine is maintained taut. The yarn is therefore restrained from whipping or flying out from the bobbin and by eliminating the ,balloonin of the yarn I prevent snarling and kin'ing and provide for a more uniform tension. When the yarn is allowed to balloon it meets with resistance, due to the air pressure, in unwinding from theebobbin, and" as the radius of the balloon is constantly fiuctuatingduring the delivery of the yarn ,the tension on the yarn will fluctuate in accordance therewith. In

other words, the play of the yarn away from the bobbin varies under diflerent conditions,

as, for instance, in unwinding from the small diameter and thenfrom the larger diameter, in going from the point to the base of the nose of the bobbin, and these variations set up corresponding changes in the air resistance which aflect the tension on the yarn. Furthermore, when the yarn is allowed to fly out from the bobbin it has a tendency to twist and loop upon itself and these loops often cause kinking and snarling. Itis obvious that when snarls or kinks occur the machine to which the yarn is delivering must be stopped and the yarn straightened out and untwisted. This results in loss of time and vwaste of'material so that the production of the machine is curtailed and the cost of the product increased. In addition, the irregularities in tension on the yarn cause defects in the fabric being manufactured, and often impair the quality of the goods so that they are fit only for seconds.

With my improved device a smooth, even tension is applied to the yarn and the tension is maintained uniform from start to finish of delivery, so that greater production of the machine is assured and defects in the fabric prevented. The yarn is prevented from kinking and snarling and, therefore, waste from this source is avoided.

Various modifications might be made in the structure and arrangement of the parts of my device without departing from the spirit or scope of the invention. Y

llhe'refore, without limiting myself to the Mid exact construction shown and described, 1

gravity to press on theyarn as the latter draws through it andbetween said member and the cap.

.2. In a tension-device for bobbins or cops, the combinatiom of two members mounted one upon the other, with one member surrounding the other member and arranged with the yarn leading through it to adapt it to revolve around its interior, and one of said members bearing on the yarn throughthe action of gravity.

3. In a tension-device for bobbins or cops, the combination with a fixed member, o f a movable member resting on the fixed member, one of said members surrounding the other member with the yarn drawing through it and adapted to revolve about the other member, said members adapted to pressupon' the yarn through the action of gravity.

4. In a tension-device for bobbins or cops,. the combinatioi of two members, one .fixed through its opening and ada ted to revolve about the other member and etween it and the other member.

5. In a tension-device for bobbins or cops, the combination with a cap formed with an upwardly-projecting stud, of a ring mounted loosely on the stud to adapt the yarn to lead under and through said ring to allow it to revolve about the stud as the yarn is drawn from the bobbin.

6. In a tension-device for bobbins or cops, the combination with a cap formed with a plug adapted to fit the bore of the bobbin support, of a ring-member mounted on the cap to adapt the yarn to lead through the ring and to be pressed thereby against the cap.

7. In a tension-device for bobbins or cops, the combination with a ca formed with a convex face and a stud pro ecting upwardl therefrom, of a ring mounted on said stu with a clearance between the two to adapt the yarn to lead across the cap and through the ring.

8. In a tension-device for bobbins or cops,

the combination with a mushroom-shaped cap formed with a plug adapted to fit the bore of the bobbin support and an upwardlyprojecting stud, of a ring surrounding the stud and arranged to press the yarn against ring formed with a slit for the insertion of the yarn into the ring.

10. In a tension-device for bobbins or co s, the combination with a fixed member, 0 a ring mounted on said member, said ring having a slit cut through it at an angle to the diametrical plane extendin across the slit. In testimony whereof I a x my signature in presence of two witnesses.

GLAES RYDEN.

Witnesses:

ARTHUR A. AnMING'roN, HERBERT K. ALLARD. 

